Piggy bank



FIG. 1 is a top perspective view of a piggy bank showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a left view thereof;

FIG. 7 is a front view thereof; and,

FIG. 8 is a back view thereof.

The broken lines shown in the drawings represent portions of the piggybank that form no part of the claimed design.

CLAIM The ornamental design for a piggy bank, as shown and described. 